Correct option is C
The correct antonym of the given word is (c) Agreement.
Controversy: A prolonged public dispute, debate, or disagreement.
Synonyms: Argument, dispute, quarrel, debate.
Antonyms: Agreement, consensus, harmony, accord.
Meanings of all options:
· Argument: A reason or set of reasons given to persuade others.
· Difference: A point or way in which things differ.
· Agreement: Harmony or accordance in opinion or feeling.
· Quarrel: An angry argument or disagreement.